:root {
    --color-orange: #ff8c00;
    --color-orange-dark: #e67e00;
    --color-black: #1a1a1a;
    --color-dark-blue: #192d64;
    --color-dark-blue-light: #2a4a8f;
    --color-white: #ffffff;
    --color-background: #f8f8f8;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-border: #e0e0e0;
    --color-line: #ff8c00;
    --radius-sm: 8px;
    --radius-md: 12px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.5;
    overflow-x: hidden;
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--color-surface);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

/* Header */
header {
    background: linear-gradient(135deg, var(--color-dark-blue) 0%, var(--color-dark-blue-light) 100%);
    color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Main Content */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg) var(--spacing-md);
    gap: var(--spacing-lg);
    overflow-y: auto;
}

/* Canvas */
.canvas-wrapper {
    width: 100%;
    background-color: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 1 / 0.6;
    min-height: 250px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Info Section */
.info-section {
    background-color: var(--color-background);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

.info-card {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
}

.info-card .label {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    font-weight: 600;
}

.info-card .value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-orange);
    min-width: 60px;
    text-align: center;
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: stretch;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-orange);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: background-color 0.2s, transform 0.2s;
}

.slider::-webkit-slider-thumb:active {
    transform: scale(1.2);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-orange);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: background-color 0.2s, transform 0.2s;
}

.slider::-moz-range-thumb:active {
    transform: scale(1.2);
}

.slider::-moz-range-track {
    background: transparent;
    border: none;
}

/* Botões */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    outline: none;
}

.btn:active {
    transform: scale(0.98);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-increase {
    background-color: var(--color-orange);
    color: white;
}

.btn-increase:active:not(:disabled) {
    background-color: var(--color-orange-dark);
}

.btn-decrease {
    background-color: var(--color-dark-blue);
    color: white;
}

.btn-decrease:active:not(:disabled) {
    background-color: var(--color-dark-blue-light);
}

.btn-reset {
    background-color: var(--color-border);
    color: var(--color-text);
}

.btn-reset:active:not(:disabled) {
    background-color: #d0d0d0;
}

.btn .icon {
    font-size: 1.3rem;
    font-weight: 700;
}

/* Instruções */
.instructions {
    background-color: var(--color-background);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.instructions h2 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-orange);
}

.instructions ul {
    list-style: none;
    padding-left: 0;
}

.instructions li {
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    position: relative;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.instructions li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--color-orange);
    font-weight: bold;
}

.instructions li:last-child {
    margin-bottom: 0;
}

/* Footer */
footer {
    background-color: var(--color-background);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* Responsiveness */
@media (min-width: 768px) {
    .container {
        max-width: 800px;
    }

    header h1 {
        font-size: 2.25rem;
    }

    .subtitle {
        font-size: 1.05rem;
    }

    .controls {
        flex-direction: row;
        gap: var(--spacing-md);
    }

    .btn {
        flex: 1;
    }

    .slider {
        flex: 1;
        align-self: center;
    }

    .info-card .value {
        font-size: 2.5rem;
    }
}

/* Scroll Bar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-background);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #ccc;
}

/* Print Styles */
@media print {
    .controls,
    .instructions,
    footer {
        display: none;
    }
}